Remove storage_list.xml

According to https://source.android.com/devices/storage/config.html
since Android 6.0, the storage_list.xml resource overlay is no longer
used by the framework.

Test: building succeeded and tested with bullhead-userdebug.
Bug: 34097942
diff --git a/overlay/frameworks/base/core/res/res/xml/storage_list.xml b/overlay/frameworks/base/core/res/res/xml/storage_list.xml
deleted file mode 100644
index b2b6a98..0000000
--- a/overlay/frameworks/base/core/res/res/xml/storage_list.xml
+++ /dev/null
@@ -1,28 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-**
-** Copyright 2015, The Android Open Source Project
-**
-** Licensed under the Apache License, Version 2.0 (the "License")
-** you may not use this file except in compliance with the License.
-** You may obtain a copy of the License at
-**
-**     http://www.apache.org/licenses/LICENSE-2.0
-**
-** Unless required by applicable law or agreed to in writing, software
-** distributed under the License is distributed on an "AS IS" BASIS,
-** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-** See the License for the specific language governing permissions and
-** limitations under the License.
-*/
--->
-
-<!-- See storage config details at http://source.android.com/tech/storage/ -->
-
-<StorageList xmlns:android="http://schemas.android.com/apk/res/android">
-    <!-- internal emulated storage -->
-    <storage
-        android:storageDescription="@string/storage_internal"
-        android:emulated="true"
-        android:mtpReserve="100" />
-</StorageList>